The world's best-connected airports for 2018

CNN
(CNN) — Atlanta might have the busiest airport and Asia might have the most in-demand flight routes, but when it comes to the world's best-connected megahubs, London's Heathrow Airport is king.

On 2018's busiest day for global aviation, there were 66,000 possible international connections between flights arriving and departing at Heathrow within a six-hour window, a new report by UK-based air travel intelligence company OAG reveals.

OAG's Megahubs International Index 2018 pits the world's biggest and busiest airports against each other to discover which lead the way as both regional and global connecting points by comparing the number of scheduled connections to and from international flights with the number of destinations served from each airport. Click through for the full list.